A few of mine dc'd, a few lagged really really hard. The ones that dc'd, now get the map server error and can't log back in. I actually have two that are still frozen in some weird lag loop that I'm afraid to log out or they'll be stuck with the map server glitch too. And yeah, all of them were on S2 when it happened.
In my experience, the only way you'll get them back on is to file a service ticket and have IGG fix the characters.

or hope for the maintenance to fix them ofc.
i know from before(when sequoia came) that people would get stuck and that the only way to fix it was: let someone else log your acc and walk it out of there.
not sure why it worked but it did. all at own risk ofc